Chuck for extension bits



March 6, v1928.

T. J. FEGLEY ET AL CHUCK FOR EXTENSION BITS Filed NOV. 25. 19,25

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Patented Mar. 6, 1928.

UNITED STATES g Lenses gPn'rlzul'rA ortica.

THOMAS J'. FEGLEY ANI) GEORGE O. IJIYSJIOPOIJD,` OF PHILADELPHIA, PENNSYLVANIA,

ASSIGNORS TO NORTH BROS. IVIFG. CO., OF

CORPORATION OF :PEN N SYLVAN IA.

PHILADELPHIA, PENNSYLVANIA, A.`

CHUCK FOR EXTENSION BITS.

Application tied' November 25, 1925.` serial no. 71,445.

The object of our'invention is to construct a chuck for extension bits that can be made very compact and strong, and which will accommodate bits having'diflerent lengths of tapered heads.

In the accompanying drawing:

Fig. 1 is a side view of an extension bit illustrating my improved chuck;

F ig. 2 is a longitudinal sectional View showing a bit having a small head secured to the extension bit by the chuck; l

F ig. 8 is an end view showing a small bit in position in the chuck; y

Figs. 4, and 5 are views similar to Figs. 2 and 3, showing a large bit in the chuck; and

Fig. 6 is a perspective view showing they parts of the chuck detached. y

The extension bit 1 has the usual spindle 2 and tapered head 2, rectangular in crosssection. This spindle 2 may be of any length desired.

The body portion 3 of the chuck 4 is secured to the spindle 2 of the extension blt l by a transverse pin 5 in the present instance, and has a flat tongue 6 projecting at its opposite end. This tongue lits a slot `7 .in a socket portion 8 of the chuck, so that while the socket portion has a limited longitudinal movement, it must turn with the body por-l tion, and with the extension bit located between the end of the body portion 3 and the socket portion 8, there is a spring 9, which tends to torce the socket portion away from the body portion.

A casing 10 encloses the parts of the chuck, and is reduced to form a shoulder 11.

The extension 12 reduced to form the shoulder has a rectangular opening therein, to allow for the passage of the rectangular head 13 of a bit 111.

On the extension bit back of the body 3 of the chuck is a loose adjusting sleeve l5,

which is held against longitudinal move-- ment by a split ring 16 located in a groove in the extension bit. At one end of the adj usting sleeve 15 is a screw-thread 17, adapted vto an internal thread on the casing l0. The balance of the sleeve 15 isv knurled to provide a handheld.

0n the outer end of the tongue 6 of the body portion 3 is an abutment 18 in the form of a headed-screw. This screw acts as an abutment for the end of a bit and also retains body portion 3.

the socket portion '8 to the body portion when the casing is removed. j

In the casing is a bayonet-slot 19, into which extends a pin 2O screwed into the When the pin 20 is in the transverse portion 21 oi the slot 19, the rectangular opening in the socket portion 8 is in alignment with the rectangular opening in the end of the casing 10.r 1

lVhen 'the casing 10 is turned to bring th pin QOfin alignment with the longitudinal portion 22 ofthe slot 19, then therectangular opening in the socket is out of alignment `with the rectangular opening in the casing, and by turning the adjusting sleeve, the casing is moved longitudinally, and locks the casing from turning while.y the pin is in the longitudinal'portion of the slot.

A chuckmade in accordance withour invention can enter comparatively small holes formed by the auger bit. Thev diameter of l the casing is the limit as there are no parts in F ig. 1, the rectangular opening in the socket portion 87erP the chuck is in alignment with the rectangular opening in the casing, and the head 13 of the bity 14 can be inserted in the chuck, the head passing the shoulder 11. The casing 1Q is then turned so that the pin 20 is in line with the portion 22 of the bayonet-slot 19. As the socket portion reniains'stationary, the rectangular opening in the casing is moved out of alignment with the rectangular opening in the socket portion, and the shoulder 11 extends under the head 13 oi the bit 14, preventing its withdrawal from the chuck.: The adjusting sleeve is turned, moving the casing 10 and the socket portion 8 longitudinally against the pressure of the spring .9 untily the end ot the head 13 of the bit 14 comes in contactwith the abutment 18, clamping thehead oi the bit between the abutment and the shoulder of the'casing.

Bitshavc diherentv lengths of heads, and in order to accommodate these heads, the socket member is allowed a certain yamount of longitudinal movement in respect to the body portion of the chuck, the springt) keeping the socket member in engagement with the head of the bit.

In Figs. 2 and 3 a comparatively short yheaded bit' is shown, and in Figs. 4 and a4 long-headed bit is shown. j Vhile the invention is described as particularly adapted to anextension bit, itina be used as a chuck on other tools if desire To release a bit, the casing is moved by turning the adjusting sleeve so that the shoulder is withdrawn from the head of the bit. If the tapered head of thebit is jammed j in the socket, a blow on the end of the ex? tension bit will release the head.

We claim: Y M j l. The coxnbinationfin a chuck, of a spindle; afbody` portion secured to the spindle; a longitudinally movable socket portion arranged `to turn with' the spindle, said body portionhaving an abutment extending into the socket of the socket portion; a easing enclosing the j portion, and having shonlderbeyond the socketA portion to engage thek head ofa bit located in the socket; `and means for moving the casing longitudinallyy to `clamp the head,

of a bit against portion. t i i i j 2. Thecombinationnin a chuck, of an ex-A tension bit;,a body portion having a tongue; a socket portion shaped to receive a bit and having a slot to receive the tongue yof the the abutment onv the` body arranged to body portion and the socket body` portion; an abutment on the tongue extending into the socket portion; a casing having a shoulder to extend under the head and held against `longitudinal movement thereon, said'sleeve engaging the casing and be turned to bring the shoulder of the casing in Contact with the head of the bit,lso as to clamp the head of the bit against the "'abutment.

`3. The combination in a chuck, of a spindle; a body portion secured to the spindle, said body portion having a` tongue at its outer end; a socket member having a slot in its inner end to receive the tongue; a spring located between the body portion and the socket member; a` screw abutment having a head, said abutment extending into theI socket, the head retaining the socket portion to the body portieri; a casing having a shoulder at itspouter end and a rectangular opening beyond Athe shoulder; a screiv threaded adjusting sleeve on the spindle back of the `body portion; and a split/ring on the spindle retaining the psleeve in position, the casing having an internalthreadto engage the thread on the adjusting sleeve.

THOMAS J; `lIGrLEY.` GEORGE O. LEOPOLD "of the bit; and a sleeve on the extension ybit i 

